diff --git a/tools/aconfig/src/aconfig.rs b/tools/aconfig/src/aconfig.rs
index 42762e2722..696e1546bc 100644
--- a/tools/aconfig/src/aconfig.rs
+++ b/tools/aconfig/src/aconfig.rs
@@ -244,7 +244,7 @@ mod tests {
     #[test]
     fn test_package_try_from_text_proto() {
         let expected = FlagDeclarations {
-            package: "ns".to_owned(),
+            package: "com.example".to_owned(),
             flags: vec![
                 FlagDeclaration { name: "a".to_owned(), description: "A".to_owned() },
                 FlagDeclaration { name: "b".to_owned(), description: "B".to_owned() },
@@ -252,7 +252,7 @@ mod tests {
         };
 
         let s = r#"
-        package: "ns"
+        package: "com.example"
         flag {
             name: "a"
             description: "A"
@@ -270,14 +270,14 @@ mod tests {
     #[test]
     fn test_flag_declaration_try_from_text_proto_list() {
         let expected = FlagValue {
-            package: "ns".to_owned(),
+            package: "com.example".to_owned(),
             name: "1234".to_owned(),
             state: FlagState::Enabled,
             permission: Permission::ReadOnly,
         };
 
         let s = r#"
-        package: "ns"
+        package: "com.example"
         name: "1234"
         state: ENABLED
         permission: READ_ONLY
diff --git a/tools/aconfig/src/cache.rs b/tools/aconfig/src/cache.rs
index f531aabfae..cdb0992d8b 100644
--- a/tools/aconfig/src/cache.rs
+++ b/tools/aconfig/src/cache.rs
@@ -109,7 +109,7 @@ pub struct CacheBuilder {
 
 impl CacheBuilder {
     pub fn new(package: String) -> Result<CacheBuilder> {
-        ensure!(codegen::is_valid_identifier(&package), "bad package");
+        ensure!(codegen::is_valid_package_ident(&package), "bad package");
         let cache = Cache { package, items: vec![] };
         Ok(CacheBuilder { cache })
     }
@@ -119,7 +119,7 @@ impl CacheBuilder {
         source: Source,
         declaration: FlagDeclaration,
     ) -> Result<&mut CacheBuilder> {
-        ensure!(codegen::is_valid_identifier(&declaration.name), "bad flag name");
+        ensure!(codegen::is_valid_name_ident(&declaration.name), "bad flag name");
         ensure!(!declaration.description.is_empty(), "empty flag description");
         ensure!(
             self.cache.items.iter().all(|item| item.name != declaration.name),
@@ -147,8 +147,8 @@ impl CacheBuilder {
         source: Source,
         value: FlagValue,
     ) -> Result<&mut CacheBuilder> {
-        ensure!(codegen::is_valid_identifier(&value.package), "bad flag package");
-        ensure!(codegen::is_valid_identifier(&value.name), "bad flag name");
+        ensure!(codegen::is_valid_package_ident(&value.package), "bad flag package");
+        ensure!(codegen::is_valid_name_ident(&value.name), "bad flag name");
         ensure!(
             value.package == self.cache.package,
             "failed to set values for flag {}/{} from {}: expected package {}",
@@ -182,7 +182,7 @@ mod tests {
 
     #[test]
     fn test_add_flag_declaration() {
-        let mut builder = CacheBuilder::new("ns".to_string()).unwrap();
+        let mut builder = CacheBuilder::new("com.example".to_string()).unwrap();
         builder
             .add_flag_declaration(
                 Source::File("first.txt".to_string()),
@@ -217,12 +217,12 @@ mod tests {
 
     #[test]
     fn test_add_flag_value() {
-        let mut builder = CacheBuilder::new("ns".to_string()).unwrap();
+        let mut builder = CacheBuilder::new("com.example".to_string()).unwrap();
         let error = builder
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    package: "ns".to_string(),
+                    package: "com.example".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
@@ -231,7 +231,7 @@ mod tests {
             .unwrap_err();
         assert_eq!(
             &format!("{:?}", error),
-            "failed to set values for flag ns/foo from <memory>: flag not declared"
+            "failed to set values for flag com.example/foo from <memory>: flag not declared"
         );
 
         builder
@@ -245,7 +245,7 @@ mod tests {
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    package: "ns".to_string(),
+                    package: "com.example".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Disabled,
                     permission: Permission::ReadOnly,
@@ -257,7 +257,7 @@ mod tests {
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    package: "ns".to_string(),
+                    package: "com.example".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadWrite,
@@ -277,7 +277,7 @@ mod tests {
                 },
             )
             .unwrap_err();
-        assert_eq!(&format!("{:?}", error), "failed to set values for flag some_other_package/foo from <memory>: expected package ns");
+        assert_eq!(&format!("{:?}", error), "failed to set values for flag some_other_package/foo from <memory>: expected package com.example");
 
         let cache = builder.build();
         let item = cache.iter().find(|&item| item.name == "foo").unwrap();
@@ -292,7 +292,7 @@ mod tests {
 
     #[test]
     fn test_reject_empty_flag_declaration_fields() {
-        let mut builder = CacheBuilder::new("ns".to_string()).unwrap();
+        let mut builder = CacheBuilder::new("com.example".to_string()).unwrap();
 
         let error = builder
             .add_flag_declaration(
@@ -313,7 +313,7 @@ mod tests {
 
     #[test]
     fn test_reject_empty_flag_value_files() {
-        let mut builder = CacheBuilder::new("ns".to_string()).unwrap();
+        let mut builder = CacheBuilder::new("com.example".to_string()).unwrap();
         builder
             .add_flag_declaration(
                 Source::Memory,
@@ -338,7 +338,7 @@ mod tests {
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    package: "ns".to_string(),
+                    package: "com.example".to_string(),
                     name: "".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
diff --git a/tools/aconfig/src/codegen.rs b/tools/aconfig/src/codegen.rs
index b60ec51c1d..8ef0e0bc94 100644
--- a/tools/aconfig/src/codegen.rs
+++ b/tools/aconfig/src/codegen.rs
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-pub fn is_valid_identifier(s: &str) -> bool {
+pub fn is_valid_name_ident(s: &str) -> bool {
     // Identifiers must match [a-z][a-z0-9_]*
     let mut chars = s.chars();
     let Some(first) = chars.next() else {
@@ -26,18 +26,40 @@ pub fn is_valid_identifier(s: &str) -> bool {
     chars.all(|ch| ch.is_ascii_lowercase() || ch.is_ascii_digit() || ch == '_')
 }
 
+pub fn is_valid_package_ident(s: &str) -> bool {
+    s.split('.').all(is_valid_name_ident)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
-    fn test_is_valid_identifier() {
-        assert!(is_valid_identifier("foo"));
-        assert!(is_valid_identifier("foo_bar_123"));
+    fn test_is_valid_name_ident() {
+        assert!(is_valid_name_ident("foo"));
+        assert!(is_valid_name_ident("foo_bar_123"));
 
-        assert!(!is_valid_identifier(""));
-        assert!(!is_valid_identifier("123_foo"));
-        assert!(!is_valid_identifier("foo-bar"));
-        assert!(!is_valid_identifier("foo-b\u{00e5}r"));
+        assert!(!is_valid_name_ident(""));
+        assert!(!is_valid_name_ident("123_foo"));
+        assert!(!is_valid_name_ident("foo-bar"));
+        assert!(!is_valid_name_ident("foo-b\u{00e5}r"));
+    }
+
+    #[test]
+    fn test_is_valid_package_ident() {
+        assert!(is_valid_package_ident("foo"));
+        assert!(is_valid_package_ident("foo_bar_123"));
+        assert!(is_valid_package_ident("foo.bar"));
+        assert!(is_valid_package_ident("foo.bar.a123"));
+
+        assert!(!is_valid_package_ident(""));
+        assert!(!is_valid_package_ident("123_foo"));
+        assert!(!is_valid_package_ident("foo-bar"));
+        assert!(!is_valid_package_ident("foo-b\u{00e5}r"));
+        assert!(!is_valid_package_ident("foo.bar.123"));
+        assert!(!is_valid_package_ident(".foo.bar"));
+        assert!(!is_valid_package_ident("foo.bar."));
+        assert!(!is_valid_package_ident("."));
+        assert!(!is_valid_package_ident("foo..bar"));
     }
 }
diff --git a/tools/aconfig/src/codegen_cpp.rs b/tools/aconfig/src/codegen_cpp.rs
index e27db9b900..65a1de18d4 100644
--- a/tools/aconfig/src/codegen_cpp.rs
+++ b/tools/aconfig/src/codegen_cpp.rs
@@ -14,28 +14,35 @@
  * limitations under the License.
  */
 
-use anyhow::Result;
+use anyhow::{ensure, Result};
 use serde::Serialize;
 use tinytemplate::TinyTemplate;
 
 use crate::aconfig::{FlagState, Permission};
 use crate::cache::{Cache, Item};
+use crate::codegen;
 use crate::commands::OutputFile;
 
 pub fn generate_cpp_code(cache: &Cache) -> Result<OutputFile> {
     let class_elements: Vec<ClassElement> = cache.iter().map(create_class_element).collect();
     let readwrite = class_elements.iter().any(|item| item.readwrite);
-    let package = cache.package().to_lowercase();
-    let context = Context { package: package.clone(), readwrite, class_elements };
+    let package = cache.package().to_string();
+    let header = package.replace('.', "_");
+    let cpp_namespace = package.replace('.', "::");
+    ensure!(codegen::is_valid_name_ident(&header));
+    let context =
+        Context { header: header.clone(), cpp_namespace, package, readwrite, class_elements };
     let mut template = TinyTemplate::new();
     template.add_template("cpp_code_gen", include_str!("../templates/cpp.template"))?;
     let contents = template.render("cpp_code_gen", &context)?;
-    let path = ["aconfig", &(package + ".h")].iter().collect();
+    let path = ["aconfig", &(header + ".h")].iter().collect();
     Ok(OutputFile { contents: contents.into(), path })
 }
 
 #[derive(Serialize)]
 struct Context {
+    pub header: String,
+    pub cpp_namespace: String,
     pub package: String,
     pub readwrite: bool,
     pub class_elements: Vec<ClassElement>,
@@ -69,7 +76,7 @@ mod tests {
 
     #[test]
     fn test_cpp_codegen_build_time_flag_only() {
-        let package = "my_package";
+        let package = "com.example";
         let mut builder = CacheBuilder::new(package.to_string()).unwrap();
         builder
             .add_flag_declaration(
@@ -109,11 +116,10 @@ mod tests {
             )
             .unwrap();
         let cache = builder.build();
-        let expect_content = r#"#ifndef my_package_HEADER_H
-        #define my_package_HEADER_H
-        #include "my_package.h"
+        let expect_content = r#"#ifndef com_example_HEADER_H
+        #define com_example_HEADER_H
 
-        namespace my_package {
+        namespace com::example {
 
             class my_flag_one {
                 public:
@@ -133,7 +139,7 @@ mod tests {
         #endif
         "#;
         let file = generate_cpp_code(&cache).unwrap();
-        assert_eq!("aconfig/my_package.h", file.path.to_str().unwrap());
+        assert_eq!("aconfig/com_example.h", file.path.to_str().unwrap());
         assert_eq!(
             expect_content.replace(' ', ""),
             String::from_utf8(file.contents).unwrap().replace(' ', "")
@@ -142,7 +148,7 @@ mod tests {
 
     #[test]
     fn test_cpp_codegen_runtime_flag() {
-        let package = "my_package";
+        let package = "com.example";
         let mut builder = CacheBuilder::new(package.to_string()).unwrap();
         builder
             .add_flag_declaration(
@@ -172,20 +178,19 @@ mod tests {
             )
             .unwrap();
         let cache = builder.build();
-        let expect_content = r#"#ifndef my_package_HEADER_H
-        #define my_package_HEADER_H
-        #include "my_package.h"
+        let expect_content = r#"#ifndef com_example_HEADER_H
+        #define com_example_HEADER_H
 
         #include <server_configurable_flags/get_flags.h>
         using namespace server_configurable_flags;
 
-        namespace my_package {
+        namespace com::example {
 
             class my_flag_one {
                 public:
                     virtual const bool value() {
                         return GetServerConfigurableFlag(
-                            "my_package",
+                            "com.example",
                             "my_flag_one",
                             "false") == "true";
                     }
@@ -195,7 +200,7 @@ mod tests {
                 public:
                     virtual const bool value() {
                         return GetServerConfigurableFlag(
-                            "my_package",
+                            "com.example",
                             "my_flag_two",
                             "true") == "true";
                     }
@@ -205,7 +210,7 @@ mod tests {
         #endif
         "#;
         let file = generate_cpp_code(&cache).unwrap();
-        assert_eq!("aconfig/my_package.h", file.path.to_str().unwrap());
+        assert_eq!("aconfig/com_example.h", file.path.to_str().unwrap());
         assert_eq!(
             expect_content.replace(' ', ""),
             String::from_utf8(file.contents).unwrap().replace(' ', "")
diff --git a/tools/aconfig/src/codegen_java.rs b/tools/aconfig/src/codegen_java.rs
index c92e87c8bc..3a96de4481 100644
--- a/tools/aconfig/src/codegen_java.rs
+++ b/tools/aconfig/src/codegen_java.rs
@@ -31,7 +31,7 @@ pub fn generate_java_code(cache: &Cache) -> Result<OutputFile> {
     let mut template = TinyTemplate::new();
     template.add_template("java_code_gen", include_str!("../templates/java.template"))?;
     let contents = template.render("java_code_gen", &context)?;
-    let mut path: PathBuf = ["aconfig", package].iter().collect();
+    let mut path: PathBuf = package.split('.').collect();
     // TODO: Allow customization of the java class name
     path.push("Flags.java");
     Ok(OutputFile { contents: contents.into(), path })
@@ -76,7 +76,7 @@ mod tests {
 
     #[test]
     fn test_generate_java_code() {
-        let package = "example";
+        let package = "com.example";
         let mut builder = CacheBuilder::new(package.to_string()).unwrap();
         builder
             .add_flag_declaration(
@@ -106,7 +106,7 @@ mod tests {
             )
             .unwrap();
         let cache = builder.build();
-        let expect_content = r#"package aconfig.example;
+        let expect_content = r#"package com.example;
 
         import android.provider.DeviceConfig;
 
@@ -118,7 +118,7 @@ mod tests {
 
             public static boolean test2() {
                 return DeviceConfig.getBoolean(
-                    "example",
+                    "com.example",
                     "test2__test2",
                     false
                 );
@@ -127,7 +127,7 @@ mod tests {
         }
         "#;
         let file = generate_java_code(&cache).unwrap();
-        assert_eq!("aconfig/example/Flags.java", file.path.to_str().unwrap());
+        assert_eq!("com/example/Flags.java", file.path.to_str().unwrap());
         assert_eq!(
             expect_content.replace(' ', ""),
             String::from_utf8(file.contents).unwrap().replace(' ', "")
diff --git a/tools/aconfig/src/codegen_rust.rs b/tools/aconfig/src/codegen_rust.rs
index e972185eaa..e27aa9cb44 100644
--- a/tools/aconfig/src/codegen_rust.rs
+++ b/tools/aconfig/src/codegen_rust.rs
@@ -24,9 +24,12 @@ use crate::commands::OutputFile;
 
 pub fn generate_rust_code(cache: &Cache) -> Result<OutputFile> {
     let package = cache.package();
-    let parsed_flags: Vec<TemplateParsedFlag> =
-        cache.iter().map(|item| create_template_parsed_flag(package, item)).collect();
-    let context = TemplateContext { package: package.to_string(), parsed_flags };
+    let parsed_flags: Vec<TemplateParsedFlag> = cache.iter().map(|item| item.into()).collect();
+    let context = TemplateContext {
+        package: package.to_string(),
+        parsed_flags,
+        modules: package.split('.').map(|s| s.to_string()).collect::<Vec<_>>(),
+    };
     let mut template = TinyTemplate::new();
     template.add_template("rust_code_gen", include_str!("../templates/rust.template"))?;
     let contents = template.render("rust_code_gen", &context)?;
@@ -38,12 +41,12 @@ pub fn generate_rust_code(cache: &Cache) -> Result<OutputFile> {
 struct TemplateContext {
     pub package: String,
     pub parsed_flags: Vec<TemplateParsedFlag>,
+    pub modules: Vec<String>,
 }
 
 #[derive(Serialize)]
 struct TemplateParsedFlag {
     pub name: String,
-    pub fn_name: String,
 
     // TinyTemplate's conditionals are limited to single <bool> expressions; list all options here
     // Invariant: exactly one of these fields will be true
@@ -52,28 +55,29 @@ struct TemplateParsedFlag {
     pub is_read_write: bool,
 }
 
-#[allow(clippy::nonminimal_bool)]
-fn create_template_parsed_flag(package: &str, item: &Item) -> TemplateParsedFlag {
-    let template = TemplateParsedFlag {
-        name: item.name.clone(),
-        fn_name: format!("{}_{}", package, &item.name),
-        is_read_only_enabled: item.permission == Permission::ReadOnly
-            && item.state == FlagState::Enabled,
-        is_read_only_disabled: item.permission == Permission::ReadOnly
-            && item.state == FlagState::Disabled,
-        is_read_write: item.permission == Permission::ReadWrite,
-    };
-    #[rustfmt::skip]
-    debug_assert!(
-        (template.is_read_only_enabled && !template.is_read_only_disabled && !template.is_read_write) ||
-        (!template.is_read_only_enabled && template.is_read_only_disabled && !template.is_read_write) ||
-        (!template.is_read_only_enabled && !template.is_read_only_disabled && template.is_read_write),
-        "TemplateParsedFlag invariant failed: {} {} {}",
-        template.is_read_only_enabled,
-        template.is_read_only_disabled,
-        template.is_read_write,
-    );
-    template
+impl From<&Item> for TemplateParsedFlag {
+    #[allow(clippy::nonminimal_bool)]
+    fn from(item: &Item) -> Self {
+        let template = TemplateParsedFlag {
+            name: item.name.clone(),
+            is_read_only_enabled: item.permission == Permission::ReadOnly
+                && item.state == FlagState::Enabled,
+            is_read_only_disabled: item.permission == Permission::ReadOnly
+                && item.state == FlagState::Disabled,
+            is_read_write: item.permission == Permission::ReadWrite,
+        };
+        #[rustfmt::skip]
+        debug_assert!(
+            (template.is_read_only_enabled && !template.is_read_only_disabled && !template.is_read_write) ||
+            (!template.is_read_only_enabled && template.is_read_only_disabled && !template.is_read_write) ||
+            (!template.is_read_only_enabled && !template.is_read_only_disabled && template.is_read_write),
+            "TemplateParsedFlag invariant failed: {} {} {}",
+            template.is_read_only_enabled,
+            template.is_read_only_disabled,
+            template.is_read_write,
+        );
+        template
+    }
 }
 
 #[cfg(test)]
@@ -86,24 +90,33 @@ mod tests {
         let generated = generate_rust_code(&cache).unwrap();
         assert_eq!("src/lib.rs", format!("{}", generated.path.display()));
         let expected = r#"
+pub mod com {
+pub mod android {
+pub mod aconfig {
+pub mod test {
 #[inline(always)]
-pub const fn r#test_disabled_ro() -> bool {
+pub const fn r#disabled_ro() -> bool {
     false
 }
 
 #[inline(always)]
-pub fn r#test_disabled_rw() -> bool {
-    flags_rust::GetServerConfigurableFlag("test", "disabled_rw", "false") == "true"
+pub fn r#disabled_rw() -> bool {
+    flags_rust::GetServerConfigurableFlag("com.android.aconfig.test", "disabled_rw", "false") == "true"
 }
 
 #[inline(always)]
-pub const fn r#test_enabled_ro() -> bool {
+pub const fn r#enabled_ro() -> bool {
     true
 }
 
 #[inline(always)]
-pub fn r#test_enabled_rw() -> bool {
-    flags_rust::GetServerConfigurableFlag("test", "enabled_rw", "false") == "true"
+pub fn r#enabled_rw() -> bool {
+    flags_rust::GetServerConfigurableFlag("com.android.aconfig.test", "enabled_rw", "false") == "true"
+}
+
+}
+}
+}
 }
 "#;
         assert_eq!(expected.trim(), String::from_utf8(generated.contents).unwrap().trim());
diff --git a/tools/aconfig/src/commands.rs b/tools/aconfig/src/commands.rs
index bc392e85a1..d252bc496e 100644
--- a/tools/aconfig/src/commands.rs
+++ b/tools/aconfig/src/commands.rs
@@ -186,9 +186,9 @@ mod tests {
     use super::*;
     use crate::aconfig::{FlagState, Permission};
 
-    fn create_test_cache_ns1() -> Cache {
+    fn create_test_cache_com_example() -> Cache {
         let s = r#"
-        package: "ns1"
+        package: "com.example"
         flag {
             name: "a"
             description: "Description of a"
@@ -201,19 +201,19 @@ mod tests {
         let declarations = vec![Input { source: Source::Memory, reader: Box::new(s.as_bytes()) }];
         let o = r#"
         flag_value {
-            package: "ns1"
+            package: "com.example"
             name: "a"
             state: DISABLED
             permission: READ_ONLY
         }
         "#;
         let values = vec![Input { source: Source::Memory, reader: Box::new(o.as_bytes()) }];
-        create_cache("ns1", declarations, values).unwrap()
+        create_cache("com.example", declarations, values).unwrap()
     }
 
-    fn create_test_cache_ns2() -> Cache {
+    fn create_test_cache_com_other() -> Cache {
         let s = r#"
-        package: "ns2"
+        package: "com.other"
         flag {
             name: "c"
             description: "Description of c"
@@ -222,19 +222,19 @@ mod tests {
         let declarations = vec![Input { source: Source::Memory, reader: Box::new(s.as_bytes()) }];
         let o = r#"
         flag_value {
-            package: "ns2"
+            package: "com.other"
             name: "c"
             state: DISABLED
             permission: READ_ONLY
         }
         "#;
         let values = vec![Input { source: Source::Memory, reader: Box::new(o.as_bytes()) }];
-        create_cache("ns2", declarations, values).unwrap()
+        create_cache("com.other", declarations, values).unwrap()
     }
 
     #[test]
     fn test_create_cache() {
-        let caches = create_test_cache_ns1(); // calls create_cache
+        let caches = create_test_cache_com_example(); // calls create_cache
         let item = caches.iter().find(|&item| item.name == "a").unwrap();
         assert_eq!(FlagState::Disabled, item.state);
         assert_eq!(Permission::ReadOnly, item.permission);
@@ -245,7 +245,7 @@ mod tests {
         let caches = vec![crate::test::create_cache()];
         let bytes = create_device_config_defaults(caches).unwrap();
         let text = std::str::from_utf8(&bytes).unwrap();
-        assert_eq!("test/disabled_rw:disabled\ntest/enabled_rw:enabled\n", text);
+        assert_eq!("com.android.aconfig.test/disabled_rw:disabled\ncom.android.aconfig.test/enabled_rw:enabled\n", text);
     }
 
     #[test]
@@ -253,12 +253,12 @@ mod tests {
         let caches = vec![crate::test::create_cache()];
         let bytes = create_device_config_sysprops(caches).unwrap();
         let text = std::str::from_utf8(&bytes).unwrap();
-        assert_eq!("persist.device_config.test.disabled_rw=false\npersist.device_config.test.enabled_rw=true\n", text);
+        assert_eq!("persist.device_config.com.android.aconfig.test.disabled_rw=false\npersist.device_config.com.android.aconfig.test.enabled_rw=true\n", text);
     }
 
     #[test]
     fn test_dump_text_format() {
-        let caches = vec![create_test_cache_ns1()];
+        let caches = vec![create_test_cache_com_example()];
         let bytes = dump_cache(caches, DumpFormat::Text).unwrap();
         let text = std::str::from_utf8(&bytes).unwrap();
         assert!(text.contains("a: Disabled"));
@@ -269,7 +269,7 @@ mod tests {
         use crate::protos::{ProtoFlagPermission, ProtoFlagState, ProtoTracepoint};
         use protobuf::Message;
 
-        let caches = vec![create_test_cache_ns1()];
+        let caches = vec![create_test_cache_com_example()];
         let bytes = dump_cache(caches, DumpFormat::Protobuf).unwrap();
         let actual = ProtoParsedFlags::parse_from_bytes(&bytes).unwrap();
 
@@ -280,7 +280,7 @@ mod tests {
 
         let item =
             actual.parsed_flag.iter().find(|item| item.name == Some("b".to_string())).unwrap();
-        assert_eq!(item.package(), "ns1");
+        assert_eq!(item.package(), "com.example");
         assert_eq!(item.name(), "b");
         assert_eq!(item.description(), "Description of b");
         assert_eq!(item.state(), ProtoFlagState::DISABLED);
@@ -294,7 +294,7 @@ mod tests {
 
     #[test]
     fn test_dump_multiple_caches() {
-        let caches = vec![create_test_cache_ns1(), create_test_cache_ns2()];
+        let caches = vec![create_test_cache_com_example(), create_test_cache_com_other()];
         let bytes = dump_cache(caches, DumpFormat::Protobuf).unwrap();
         let dump = ProtoParsedFlags::parse_from_bytes(&bytes).unwrap();
         assert_eq!(
@@ -302,10 +302,14 @@ mod tests {
                 .iter()
                 .map(|parsed_flag| format!("{}/{}", parsed_flag.package(), parsed_flag.name()))
                 .collect::<Vec<_>>(),
-            vec!["ns1/a".to_string(), "ns1/b".to_string(), "ns2/c".to_string()]
+            vec![
+                "com.example/a".to_string(),
+                "com.example/b".to_string(),
+                "com.other/c".to_string()
+            ]
         );
 
-        let caches = vec![create_test_cache_ns2(), create_test_cache_ns1()];
+        let caches = vec![create_test_cache_com_other(), create_test_cache_com_example()];
         let bytes = dump_cache(caches, DumpFormat::Protobuf).unwrap();
         let dump_reversed_input = ProtoParsedFlags::parse_from_bytes(&bytes).unwrap();
         assert_eq!(dump, dump_reversed_input);
diff --git a/tools/aconfig/src/test.rs b/tools/aconfig/src/test.rs
index 621381afb6..21ef74d7dc 100644
--- a/tools/aconfig/src/test.rs
+++ b/tools/aconfig/src/test.rs
@@ -21,7 +21,7 @@ pub mod test_utils {
 
     pub fn create_cache() -> Cache {
         crate::commands::create_cache(
-            "test",
+            "com.android.aconfig.test",
             vec![Input {
                 source: Source::File("testdata/test.aconfig".to_string()),
                 reader: Box::new(include_bytes!("../testdata/test.aconfig").as_slice()),
diff --git a/tools/aconfig/templates/cpp.template b/tools/aconfig/templates/cpp.template
index deb5012db4..331baafda6 100644
--- a/tools/aconfig/templates/cpp.template
+++ b/tools/aconfig/templates/cpp.template
@@ -1,11 +1,10 @@
-#ifndef {package}_HEADER_H
-#define {package}_HEADER_H
-#include "{package}.h"
+#ifndef {header}_HEADER_H
+#define {header}_HEADER_H
 {{ if readwrite }}
 #include <server_configurable_flags/get_flags.h>
 using namespace server_configurable_flags;
 {{ endif }}
-namespace {package} \{
+namespace {cpp_namespace} \{
     {{ for item in class_elements}}
     class {item.flag_name} \{
         public:
diff --git a/tools/aconfig/templates/java.template b/tools/aconfig/templates/java.template
index 44c470c9e3..709af4422f 100644
--- a/tools/aconfig/templates/java.template
+++ b/tools/aconfig/templates/java.template
@@ -1,4 +1,4 @@
-package aconfig.{package};
+package {package};
 {{ if readwrite }}
 import android.provider.DeviceConfig;
 {{ endif }}
diff --git a/tools/aconfig/templates/rust.template b/tools/aconfig/templates/rust.template
index a3c58c0a71..81b407c244 100644
--- a/tools/aconfig/templates/rust.template
+++ b/tools/aconfig/templates/rust.template
@@ -1,23 +1,29 @@
+{{- for mod in modules -}}
+pub mod {mod} \{
+{{ endfor -}}
 {{- for parsed_flag in parsed_flags -}}
 {{- if parsed_flag.is_read_only_disabled -}}
 #[inline(always)]
-pub const fn r#{parsed_flag.fn_name}() -> bool \{
+pub const fn r#{parsed_flag.name}() -> bool \{
     false
 }
 
 {{ endif -}}
 {{- if parsed_flag.is_read_only_enabled -}}
 #[inline(always)]
-pub const fn r#{parsed_flag.fn_name}() -> bool \{
+pub const fn r#{parsed_flag.name}() -> bool \{
     true
 }
 
 {{ endif -}}
 {{- if parsed_flag.is_read_write -}}
 #[inline(always)]
-pub fn r#{parsed_flag.fn_name}() -> bool \{
+pub fn r#{parsed_flag.name}() -> bool \{
     flags_rust::GetServerConfigurableFlag("{package}", "{parsed_flag.name}", "false") == "true"
 }
 
 {{ endif -}}
 {{- endfor -}}
+{{- for mod in modules -}}
+}
+{{ endfor -}}
diff --git a/tools/aconfig/testdata/first.values b/tools/aconfig/testdata/first.values
index c7b8a65e95..e5244041a3 100644
--- a/tools/aconfig/testdata/first.values
+++ b/tools/aconfig/testdata/first.values
@@ -1,17 +1,17 @@
 flag_value {
-    package: "test"
+    package: "com.android.aconfig.test"
     name: "disabled_ro"
     state: DISABLED
     permission: READ_ONLY
 }
 flag_value {
-    package: "test"
+    package: "com.android.aconfig.test"
     name: "enabled_ro"
     state: DISABLED
     permission: READ_WRITE
 }
 flag_value {
-    package: "test"
+    package: "com.android.aconfig.test"
     name: "enabled_rw"
     state: ENABLED
     permission: READ_WRITE
diff --git a/tools/aconfig/testdata/second.values b/tools/aconfig/testdata/second.values
index 895b75bcf5..aa09cf6a56 100644
--- a/tools/aconfig/testdata/second.values
+++ b/tools/aconfig/testdata/second.values
@@ -1,5 +1,5 @@
 flag_value {
-    package: "test"
+    package: "com.android.aconfig.test"
     name: "enabled_ro"
     state: ENABLED
     permission: READ_ONLY
diff --git a/tools/aconfig/testdata/test.aconfig b/tools/aconfig/testdata/test.aconfig
index ff07473b3e..015f295e85 100644
--- a/tools/aconfig/testdata/test.aconfig
+++ b/tools/aconfig/testdata/test.aconfig
@@ -1,4 +1,4 @@
-package: "test"
+package: "com.android.aconfig.test"
 
 # This flag's final value is calculated from:
 # - test.aconfig: DISABLED + READ_WRITE (default)